[Q] How to use phone storage as primary saving location? topic

Hi! I have Iocean X7S phone, which runs perfect except one problem. X7S has opportunity to save apps to either internal storage, phone storage or external SD-card. However, I can't use phone storage as saving location. In Settings -> Storage -> Default write disk there is Phone storage and SD card. However, whichever I choose as primary, there doesn't happen anything. If external SD card is mounted, there is "Move to SD card" button in apps and a tab SD card in Settings -> Apps. If I unmount SD card, there disappears opportunity to choose primary save location, SD card tab and button to move app another location.

I have tried factory reset different ways without any result, there is still only opportunity to keep apps in internal storage or SD-card. In \storage\sdcard0 is external SD-card and sdcard1 is phone storage.